57991143 has 16 divisors (see below), whose sum is σ = 88519680. Its totient is φ = 33080736.

The previous prime is 57991123. The next prime is 57991147. The reversal of 57991143 is 34119975.

It is a happy number.

It is not a de Polignac number, because 57991143 - 2⁶ = 57991079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57991147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12178 + ... + 16256.

It is an arithmetic number, because the mean of its divisors is an integer number (5532480).

Almost surely, 2^57991143 is an apocalyptic number.

57991143 is a deficient number, since it is larger than the sum of its proper divisors (30528537).

57991143 is a wasteful number, since it uses less digits than its factorization.

57991143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4766.

The product of its digits is 34020, while the sum is 39.

The square root of 57991143 is about 7615.1915931249. The cubic root of 57991143 is about 387.0679594078.

The spelling of 57991143 in words is "fifty-seven million, nine hundred ninety-one thousand, one hundred forty-three".